Frequencies for first 10,000 rows of dr_sf4 variable in vehicle dataset :

     driver |
    related |
 factors (4 |
   choices) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,444       94.44       94.44
         37 |          1        0.01       94.45
         39 |          1        0.01       94.46
         48 |          1        0.01       94.47
         51 |          2        0.02       94.49
         58 |          3        0.03       94.52
         74 |          3        0.03       94.55
         84 |          1        0.01       94.56
         87 |          2        0.02       94.58
         91 |          6        0.06       94.64
         99 |        536        5.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016